1/4 scale Porsche 917 180 degree V12 Build

[Vixen]

I checked the fixture before and after each section was turned and it was consistently in the .0002-.0004" radially and axial run out range.  That said, I don't think I could do any better if I tried.     I've not measured it yet, but I will, but I think it'll be fine.   The fixture worked very well, and asl long as you were gentle, it stayed put.   

.  .  .  .  .  .

  Just keep and eye on the fixture, and keep checking it with a dial indicator to make sure it stays true.

Dave

If you keep checking the fixture and it stays put and always indicates true; then there is not much else you can do. The crankshaft will be as true as you can make it.

Did I say it looks fantastic.

Mike

[steamer]

I checked the fixture before and after each section was turned and it was consistently in the .0002-.0004" radially and axial run out range.  That said, I don't think I could do any better if I tried.     I've not measured it yet, but I will, but I think it'll be fine.   The fixture worked very well, and asl long as you were gentle, it stayed put.   

.  .  .  .  .  .

  Just keep and eye on the fixture, and keep checking it with a dial indicator to make sure it stays true.

Dave

If you keep checking the fixture and it stays put and always indicates true; then there is not much else you can do. The crankshaft will be as true as you can make it.

Did I say it looks fantastic.

Mike

Thanks Mike!!!    I'm excited!     Rods and bearings next!

I'm going to pick up the gears for the distributors /fan this week, so I can finalize the rest of the gears.    Lots more gear cutting in my future!!!...

Dave

[Admiral_dk]

Woa - now this is a major point in this build that you just completed and it looks fantastic 

Looking forward to the rest as you find time       

Per

[steamer]

Woa - now this is a major point in this build that you just completed and it looks fantastic 

Looking forward to the rest as you find time       

Per

Definitely the hardest part of this build I think    I think if I can build this, I can build the rest.

Dave

[RReid]

Congratulations on getting the crankshaft done successfully, Dave! It looks great!

[Hugh Currin]

Dave:

Very nice results. It almost looks like 6 cranks in bearings connected together, as in each is solid by itself only needing to transmit torque on down the line. Very unique and allows roller bearings. I'm surprised the original used bushings.

How do you keep the toothbrush clean??

Again, great results. Thanks.

Crank is done!!!

Interestingly enough, the best way to get the small chips off the parts while I was machining was a clean toothbrush!!..

[steamer]

How do you keep the toothbrush clean??

Ya know Hugh,   I have no idea.   I have not noodled why the brush works and nothing else would, there doesn't appear to be anything on the brush....I suspect electrostatic effects....but all I know is it worked amazingly well!!!

Dave

[steamer]

Bevel gears for the fan drive on order....they  dont give those away at Mcmaster carr!....

Dave

[crueby]

Dave, why not cut your own bevel gears? Not that much harder than the straight ones you cut.

[steamer]

Other things to machine....

[steamer]

In the interest of getting accurate shaft centerlines, I'm working on the fan shaft gears and the output shaft gear trains, so I can measure that up and work it into the block dimensions.  I got the bevel gears so I'm working that out now.   Hopefully I'll have some pictures to show tomorrow....



Work is about to get nuts....

Dave

[stevehuckss396]

I hear you steamer. I'm finally making good progress on the radials and I'm hearing 7 days 12 hours at the end of February. Just plug along when you get time and the crazy will end someday.

[steamer]

I hear you steamer. I'm finally making good progress on the radials and I'm hearing 7 days 12 hours at the end of February. Just plug along when you get time and the crazy will end someday.

Thanks buddy....The struggle is real!

Dave

[ozzie46]

I hear you steamer. I'm finally making good progress on the radials and I'm hearing 7 days 12 hours at the end of February. Just plug along when you get time and the crazy will end someday.

UH Wait Radials What radials?

Ron

[steamer]

I hear you steamer. I'm finally making good progress on the radials and I'm hearing 7 days 12 hours at the end of February. Just plug along when you get time and the crazy will end someday.

UH Wait Radials What radials?

Ron

  I know something you dont........